Answer Happy

A Stat 510 student works at the IT Help Desk at Hale Library. For several weeks, the student recorded how long it took to solve the walk-in problems she attended. A random sample of n= 14 walk-in problems was selected and times are listed below. 18.60 19.30 18.48 12.88 17.02 14.62 17.36 17.50 22.18 22.17 17.51 18.92 19.52 20.31

13. Another important factor the IT Help Desk supervisor needs to estimate for this staffing decisions is what proportion of walk-in requests do not have an easy solution and need to be addressed by a senior staff member. Of the 35 walk-ins our student worker recorded, 5 had to be referred to a senior member of the staff. Find the 90% confidence interval for the proportion, p, of walk-in problems that may need to be addressed by a senior staff member. (a) Between 0.0469 and 0.3344 (b) Between 0.0578 and 0.2985 (c) Between 0.0646 and 0.2786

(d) Between 0.0617 and 0.2829 (e) Between 0.0682 and 0.2687 (f) None of the others.